Auxiliary motor cut-off for pressure systems



June 23, 1925.

S'. S. BIGLER AUXILIARY lo'ron GUT-OFF Fon PRESSURE sYsTEIs F1106 Jau. 26, 1924 f Ina-E Mill l 5M f a tot Patented .lune 23, 1925.

i eliminan s. Brommer' New PHILADELPHIA, offro.'

Ummm? Moron cur-,Orr vron 'PRESSURE SYSTEMS.

Application tiled January 26,1924. Serial No. 688,887

' .To all whom t may concern.'

. to improve upon-.wster-pumping systems of f water.

Be it known that I, SHEnmAN S. BIGLER, a citizen of the United States, residing at New Philadel hia, in the county of Tuscarawas and Slate of Ohio, have invented certain new and useful Improvements in Auxiliary Motor Cut-Offs for Pressure Systems; andI do declare the following to be a full, clear,'and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

, c Myinvention relatesgenerallyto pressure systems for handling water, airor any other liquid or fluid, but it is my primary intent the type in which a motor-driven pump is employed vfor forcingwater into atankvand compressing air in this tank, so that the air pressure may be used to discharge the Pressure` systems of this character are provided withl anV automatic pressureoperated switch for cutting olf the pump motor when the pressure has reached a predetermined degree, but automatic switches of this nature very often fail to operate, and hence, the excess pressure must escape through a blow-offvalve, but no provision is made for then stopping the motor, with the result that the latter often runs continuously for long periods of time, with very detrimental results.

It is the principal object of the invention to provide an auxiliary, pressure-operated cut-olf for the ump motor which is adapted to come into p ay at a higher pressure than the usual automatic cut-off, whereby to stop the motor in case the ordinary cut-olf fails to function.

Pressure systems of the type to which I have referred are commonly provided with a manually operated switch 1n the current supply line for the pump motor, and it is a further object to provide the auxiliary cutoii means of such form as to operate this hand Switch to obtain the desired results.

Yet another object is to provide a workproducing device operated by escaping pressure from the usual pressure blow-olf of the system, said work-producing device being primarily intended for stopping the pump motor, although it might in some instances be utilized for other purposes, for instance, to Sound an alarm and thus give warning that the automatic switch has not operated and that pressure is escaping through the blow-off valve.

-A still further objectl isy to provide -a simple and inexpensive construction which may be quickly and easily attached to the ordinary blow-off valve of a pressure system. n

With the foregoing in View, the invention residesin the novel subject matter hereinafter described and claimed, the description being supplemented bythe accompanying drawing. "f 2 i Figure 1 is a diagrammatic View showing a water pumping' system embodying vmy improvements.

' Figure 2 is an enlarged side elevation of the pressure blow-off valve, the attachment connected therewith, and associated parts. rFigure 3 is an enlarged vertical sectional view through the parts shown in Fig. 2.

Figure 4 vis a sectional view similar to the upper portion of Fig. 3 and illustrating the'y manner in which the attachment operates.

In the drawing above briey described, the numeral 1 designates an lair and water tank, represents a pump connected with the tank by piping 3,r 4 has reference to the operating motor for the pump 2, and 5 indicates an automatic pressure-operated cut-0HA switch for thefmotor4. At 6,fa hand-operatedv switch is provided for entirely cutting olf the flow of current to the motor -4 whenever desired, said switchy 6 being shownof thevusual knife type, h aving an operating handle 7 at one end.

Connected with the piping 3, I have shown a pressure blow-oli' valve 8 which is adapted to come into play in case the automatic switch 5 fails to function, and it will be understood that this valve may be connected with any desired part of the system and is not necessarily connected with the piping 3. In the present disclosure, I utilize the pressure escaping through the exhaust port 9 of the valve 8, for the purpose of opening the switch 6. In obtaining this result, I connect a cylinder 10 with the port 9, for instance,`rby an elbow 11 which may well have a pet-cock 12. lrVhile not necessarily so, I have illustrated the cylinder 10 standing upright and provided at its upper end with a cap 13. Through this cap, a rod or stem 14 passes, said stem being connected to a piston 15 in the cylinder 10, soas to be moved outwardly by this piston, when pressure escapes through the port i). On the outer end of the stem 14, l have shown a U-shaped seat 16 which is adapted to strike the switch handle 7 as shown in Fig'. si, thereby opening the switch when the seat is torced outwardly. To always retain this seat in proper relation with the handle, I make suitable provision for holding the rod 14- against turning and for limitingits downward movement. I prefer to square the rod and the opening in the ap 13 through which it passes to prevent rotation, and to provide a pin 17 carried by the rod and adapted to strike the cap 13 to limit the descmt of the rod and associated parts.

To properly mount the switch in operative relation with the stem 1t and in order that this switch may be easily installed in the system, I preiler to mountit upon a suitably shaped bracket 18 which may well be clamped to the cylinder 10 by appropriate clamps 19,

Then the arrangement shown and described is employ d, or an equivalent arrangement, if the switch 5 tails to operate, rising pressure in the tank 1, will cause opening of the pressure blow-eti' valve 8 and escape of pressure through the port 9. This pressure acts on the piston 15 and in the present instance, opens the switch 6 to stop the motor t, but it is to he understood that this piston 15 or an equivalent device may be used to perform other work. For instance, l may, it' desired, utilize the escaping pressure trom the blow-oil valve to operate an alarm and thus give warning that the automatic switch 5 has not operated and pressure is high. It is preferable, to have the means which is controlled by the exhaust pressure actually throw the pumping motor out et play, as the premises in which pumping systems are used, are very often vacant for dillerent periods of time,

and there would hence be no attendant for the pumping system, to give heed to any warning as to excess pressure.

As excellent results have been obtained from the general association disclosed, it is preferably followed, but within the scope ot the invention as claimed, numerous changes may be made.

I claim:

1. The combination with a cylinder adapted to receive pressure; of a bracket having a portion contacting with the outer side ot said cylinder and a ortion projecting laterall)7 from one end) of the latter, means securing the first named portion of the bracket to the c vlinder, a hand-closed switch including a base mounted on said bracket and a handle extending across said one end of the cylinder, and a piston in said cylinder having a stem positioned to thrust outwardly upon said handle and open the switch.

A ressure-operated switch comprising a cylint er adapted to receive pressure, an L-shaped bracket having one ot its ends parallel with the cylinder and its other end extended laterally trom said cylinder, clamps embracing said first named end ot the bracket and the cylinder to secure said bracket to said cylinder, a manually controlled knife switch mounted upon the laterally extending end ot` said bracket and having an operating handle spaced outwardly from and in line with the aforesaid cylinder, a pressare-operated piston in said cylinder having a rod extending to a point adjacent said handle, and U-shaped seat carried by the outer end ot said rod to engage said handle and open the switch when the piston and rod are forced outwardly.

In testimony whercot1 I have hereunto atlixed my signature.

SHERIDN S. BIGLER. 

